within the next few months i'm getting a SE spec 1.6 TDI octy i know it doesn't come with cruise control unless its a optional extra but can it be retro fitted

I bought an SE+ last month & the dealer fitted cruise control for me.

Yes, it can be easily retrofitted.

any idea how much it would cost?

I helped someone here fit cruise control for the grand total of about £45

Cost him £30 to get the stalk, and £15 to buy me a box of beer to get his car coded correctly (I have VCDS)

As posted above fairly easy, although on a newer car the stalks are different

Costs £125 fully fitted at Shark Performance for my 07 reg.